Measurement of neutrino oscillation parameters from muon neutrino disappearance with an off-axis beam

Bentham, Steven and Bertram, Iain and Finch, Alex and Kormos, Laura and O'Keeffe, Helen and Ratoff, Peter and Reeves, Matthew and Southwell, Luke and Dealtry, Thomas James and Brailsford, Dominic Bevan (2013) Measurement of neutrino oscillation parameters from muon neutrino disappearance with an off-axis beam. Physical review letters, 111 (21). ISSN 1079-7114

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Abstract

The T2K Collaboration reports a precision measurement of muon neutrino disappearance with an off-axis neutrino beam with a peak energy of 0.6 GeV. Near detector measurements are used to constrain the neutrino flux and cross section parameters. The Super-Kamiokande far detector, which is 295 km downstream of the neutrino production target, collected data corresponding to 3.01×1020 protons on target. In the absence of neutrino oscillations, 205±17 (syst) events are expected to be detected while only 58 muon neutrino event candidates are observed. A fit to the neutrino rate and energy spectrum, assuming three neutrino flavors and normal mass hierarchy yields a best-fit mixing angle sin⁡2(θ23)=0.514±0.082 and mass splitting |Δm322|=2.44-0.15+0.17×10-3  eV2/c4. Our result corresponds to the maximal oscillation disappearance probability.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Additional Information:
© 2013 American Physical Society
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
67672
Deposited By:
Deposited On:
23 Nov 2013 00:03
Refereed?:
Yes
Published?:
Published
Last Modified:
03 Jul 2020 01:11